<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
</head>

<body>
    <button>rich</button>
    <button>rich</button>
    <button>rich</button>
    <button>rich</button>
    <button>rich</button>
    <button>rich</button>
    <button>rich</button>

    <script src="../jquery.min.js"></script>
    <script>
        $(function() {})
    </script>
</body>

</html>

//链式编程：节约代码量，看起来更优雅